[simpits-tech] HUD/Reflector Gun Sight question

[Akin, Keenan L]

I understand that modern HUD combiner glasses have multiple types of
coatings and treatments that remedy this and other problems.  However, I was
under the impression that WWII Reflector Gun Sights used plain ol'
glass/plexiglas (of course, I could be wrong).  The easy answer is to use a
reflector pane that is very thin.  The only issue there is that it doesn't
look like an authentic reflector sight.

As far as focus, I am making my own sight, not using a real one ($$$).  I
just wondered if anyone else had done this and what lenses they used.

-----Original Message-----
From: Gene Buckle [mailto:geneb@deltasoft.com]
Sent: Monday, January 13, 2003 11:06 AM
To: 'simpits-tech@simpits.org'
Subject: Re: [simpits-tech] HUD/Reflector Gun Sight question


> At the risk of asking something that has been asked/answered before (I am
> new to the list), does anyone have experience with DIY HUDs or Reflector
> Sights?  The two questions I have are:
>
> 1.  How do you get rid of the double reticle image (due to reflection from
> both near and far surfaces of the reflector glass)?

This is controlled by the refractive properties of the combining glass.
AFAIK, the front surface is just a bit more reflective than the rear
surface.

> 2.  How do you focus the reticle at infinity (so that it appears in focus
> with the view on the projector screen)?
>
A standard HUD or gunsight is already focused at infinity.  You need to
focus it to the face of the screen you're displaying the exterior images
on.

g.


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Thanks!